Various C library adjustments

Fix weird linking issues with newlib:
- Get rid of dlmalloc
- Also get rid of klmalloc

Adjust crt0 operation:
- Kill the dead loop at the end
- Pass main to pre_main as a function pointer to move `main` reference
  into crt0.o

- Fix a build script derp with trying to remove build and local
  directories (gets rid of some warnings)

toolchain/patches/newlib/toaru/crt0.s

@@ -5,13 +5,9 @@ global _start
 _start:             ; Global entry point
 	pop    eax      ; Our stack is slightly off
 	extern pre_main     ;
+	extern main
+	push main
 	call   pre_main     ; call C main function
-	mov    ebx, eax ; return value from main
-	mov    eax, 0x0 ; sys_exit
-	int    0x7F     ; syscall
-_wait:              ; wait until we've been deschuled
-	hlt
-	jmp    _wait
 
 ; vim:syntax=nasm
 ; vim:noexpandtab

toolchain/patches/newlib/toaru/syscalls.c

@@ -320,7 +320,7 @@ struct dirent * readdir (DIR * dirp) {
 	return &ent;
 }
 
-void pre_main(int argc, char * argv[]) {
+void pre_main(int (*main)(int,char**), int argc, char * argv[]) {
 	unsigned int x = 0;
 	unsigned int nulls = 0;
 	for (x = 0; 1; ++x) {

toolchain/prepare.sh

@@ -73,7 +73,11 @@ pushd "$DIR" > /dev/null
         installNewlibStuff "newlib-1.19.0"
     popd > /dev/null
 
-    mkdir build
-    mkdir local
+    if [ ! -d build ]; then
+        mkdir build
+    fi
+    if [ ! -d local ]; then
+        mkdir local
+    fi
 
 popd > /dev/null

toolchain/util.sh

@@ -31,8 +31,6 @@ function patc () {
 function installNewlibStuff () {
     cp -r ../patches/newlib/toaru $1/newlib/libc/sys/toaru
     cp -r ../patches/newlib/include/* $1/newlib/libc/sys/toaru/
-    # dlmalloc
-    cp -r ../patches/newlib/malloc.c $1/newlib/libc/stdlib/malloc.c
     cp -r ../patches/newlib/setjmp.S $1/newlib/libc/machine/i386/setjmp.S
 }